<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        iframe{
            width: 100px;
            height: 100px;
            border: 1px solid #666;
        }
    </style>
</head>
<body> 
    <iframe src="02-user.html" frameborder="" name="frame"></iframe>
    <a href="02-user.html" target="frame">用户名</a>
    <a href="03-phone.html" target="frame">绑定</a>
</body> 
</html>